C#如何获取控件TextBox的ReadOnly值是true还是false

需要判断控件TextBox是否可以输入，将文本内容自动填入该TextBox

回答：简单写了一个说明

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button_fill_Click(object sender, EventArgs e)
        {
            //将文本内容自动填入？什么文本内容呢？这里默认给一个字符串吧

            if (!textBox1.ReadOnly)
                textBox1.Text = "你好,world";
        }

        private void button_turn_Click(object sender, EventArgs e)
        {
            textBox1.ReadOnly = !textBox1.ReadOnly;
        }

        private void button_clear_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }
    }
}